IsoBuster 

IsoBuster is an expert and low cost utility to do data recovery from CD and DVD. All File-Systems are supported. Supports an enormous range of image files ! Comprehensive help file, Scanning for lost UDF files and folders, CD/DVD Surface scan.
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Space Pyramids 

Try to challenge yourself while you are an aeronaut of an orbiting station. You have to build solar batteries on the flying station or you will be dead. This honorary mission will challenge you and you should rely on your logic.
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LOTA - The Obsidian Disc 

LOTA - The Obsidian Disc is what's known as a 'code wheel defeater' for an old C64 computer game, called Legacy of the Ancients
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